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objective (ob-jek´tiv)   perceptible by the external senses.
  the lens or system of lenses of a microscope nearest the object that is being examined.
 

achromatic objective  one in which the chromatic aberration is corrected for two colors and the spherical aberration for one color.

apochromatic objective  one in which chromatic aberration is corrected for three colors and the spherical aberration for two colors.

flat field objective  a microscopic objective that provides an image in which all parts of the field are simultaneously in focus.

immersion objective  one designed to have its tip and the coverglass over the specimen connected by a liquid instead of air.





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